Mixtures and Chemical Reactions Quiz

Which of the following is an example of a heterogeneous mixture?

• salt water

• air

• trail mix

• gold

Which classification would best describe a salad with lettuce, tomatoes, and croutons?

• element

• compound

• homogeneous mixture

• heterogeneous mixture

Which of the following can be identified using the periodic table when analyzing a chemical reaction?

• The number of atoms in a molecule

• The type of elements involved based on their atomic symbols

• The speed of the chemical reaction

• The exact energy released during the reaction

Tags

NGSS.MS-PS1-2

Using the periodic table, how can you determine the reactivity of an element involved in a chemical reaction?

• by its atomic mass

• by its group and period placement

• by its physical state (solid, liquid, gas)

• by its isotopic abundance

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following scenarios best illustrates the cohesive, adhesive, and surface tension properties of water?

• Water droplets sticking to the surface of a leaf and forming a spherical shape

• Water heating up quickly when exposed to sunlight

• Water freezing into ice at 0°C

• Water dissolving sugar completely

Which of the following correctly compares acids and bases?

• Acids have a pH greater than 7, while bases have a pH less than 7.

• Acids release hydrogen ions (H⁺) in solution, while bases release hydroxide ions (OH⁻).

• Acids turn blue litmus paper red, while bases do not affect litmus paper.

• Acids are slippery to the touch, while bases are sour in taste.

Which of the following is a common property of bases?

• They taste sour and have a pH less than 7.

• They feel slippery and turn red litmus paper blue.

• They release hydrogen ions (H⁺) in solution.

• They react with metals to produce hydrogen gas.

Which of the following best explains how mass is conserved during a chemical reaction?

• The total number of atoms remains the same before and after the reaction, as they are rearranged into new substances.

• The total mass decreases because energy is released during the reaction.

• The mass of the reactants increases because new atoms are created during the reaction.

• The number of molecules stays the same, even if some atoms are destroyed.

Tags

NGSS.MS-PS1-5

In the photosynthesis reaction, 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂, how does the equation demonstrate conservation of mass?

• The total mass is not conserved because glucose is heavier than water and carbon dioxide.

• The number of atoms of each element in the reactants equals the number of atoms of each element in the products.

• The mass of the oxygen molecules decreases because energy from sunlight is absorbed.

• The equation does not demonstrate conservation of mass because the reaction requires sunlight.

Tags

NGSS.MS-PS1-5

What type of galaxy is characterized by its spiral structure with arms winding outward from a central bulge?

• elliptical

• spiral

• lenticular

• irregular